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    <title>Document</title>
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    <div class="txt_bk billingBox face_video">
        <p><span class="star">*</span><span>CA渠道：</span></p>
        <input id="channelBei" class="" type="radio" name="channel" value="1">
        <label for="channelBei">北京CA</label>
        <input id="channelTian" class="channelType"  type="radio" name="channel" value="2">
        <label for="channelTian">天津CA</label>
        <input id="channelShan" class="channelType"  type="radio" name="channel" value="3">
        <label for="channelShan">山东CA</label>
        <input id="channelChong" class="channelType"  type="radio" name="channel" value="4">
        <label for="channelChong">重庆CA</label>
        <input id="channelHai" class="channelType"  type="radio" name="channel" value="5">
        <label for="channelHai">上海CA</label>
    </div>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <script>
        $(".face_video > input").prop("checked", false);
        $(".face_video > input[name='channel'][value='4']").prop("checked", "checked");
    </script>
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